Timescale: Animation does not work

[v-avdeev]

Repro steps:

1. Move to consmos timeline as in screenshot (max to left and bottom position)
   
2. Move cursor to right-top position (as in screenshot)
   
3. Scroll up on mouse (zoom timelines)

Actual result:
Animation of zoom is not working

Expected result:
Animation of zoom is not working

[javierluraschi]

Reproed this, looks fixed to me.

[v-avdeev]

I think that if bug #54 will be repaired, and user won't be able to move parent timeline (Cosmos) beyond all bounds to the left, this bug will be actual.